So you can now embed stuff just by pasting the link into your post, like SoundCloud:

Twitch:

Twitter:

And of course Youtube:

The existing Youtube bbcode has been disabled to allow this to work and this has broken those existing embeds. I don't see a way of safely converting the old to the new in one hit (there probably is, I just don't see it - the problem I see is with multiple embeds in the same post). There are 5299 embedded Youtube videos in the forum and I don't fancy doing them all individually!